How to use the Steam client without mouse? Hotkeys anyone?

I like working with hotkeys as much as possible, yet the Steam client supports almost none (or google won't tell me).

"Alt" and "Menu" hotkeys that work with most Windows programs aren't supported by it. Which makes it impossible to navigate Steam without a mouse, which really starts to annoy me because there's no reason to not have hotkeys.

Actions I want hotkeys for:

• navigate both menu bars
• forward/backward buttons
• open drop-down menus (of games)
• switch library view modes
• open/close categories
• navigate game sidebar/links
• open/navigate friends list
• open downloads window

Actions where hotkeys exist:

• up/down in library
• strg+F for searching library
• typing game name/starting letter to highlight it
• enter to start/install game
• alt+enter for Big Picture

Speaking of Big Picture, you can navigate it mostly without a mouse, but obviously it's made to be used with controllers.

Am I stupid, or does Steam support basically no hotkeys at all? If so, why?
If you do know of more hotkeys PLEASE do tell. Thanks.

I know such topic belongs to the "steam discussions", but it hurts using the forums there.

tl;dr want to navigate steam client with hotkeys but gaben says "what are hotkeys? here you can buy skins instead"